Xml and XmlTextReader.Read() method

Question

Hi everyone: Here i'm trying to create login acounts as xml file and i'm have a windows app. with two textboxes and a button, what i want is: when a user enters their userName and passWd to the respective textBoxes and clicking the button the following shoukd happen: an xml reader should read through the xml file and compare textbox valued with the nodes in xml file if they are the same it should pop up a MessageBox.Show("You are logged on") otherwise ("You are not logged on") here is my 1.Xml file (accounts.xml) 2. Just a piece of code System.Xml XmlTextReader rdr = new XmlTextReader("accounts.xml"); while(rdr.Read()) { //perform some comparison here } can someone help me please, i'm new to C#, i'm a C/C++ programmer